* International Scale of ambatchmasterpublisher Difficulty – The scale is used to rate the challenges of navigation—particularly those with rapids. Class I is the easiest and Class VI is the hardest. * Strahler Stream Order – The Strahler Stream Order is a method to rank ambatchmasterpublishers based on the connectivity and hierarchy of contributing tributaries. Headwaters are first order while Amazon ambatchmasterpublisher is twelfth order. Approximately 80 percent of the ambatchmasterpublishers and streams on Earth are of the first and second order.